Pediatrics A child with large perimembranous VSD has congestive heart failure. What may be the cause of improvement of cardiac failure in the patient – A Aortic regurgitation B Vascular changes in pulmonary circulation C Infective endocarditis D Closure of VSD spontaneously 💡 Explanation A child with large perimembranous VSD has congestive heart failure. What may be the cause of improvement of cardiac failure in the patient – ✓ Correct Answer: B. Vascular changes in pulmonary circulation